I see, but don't you think that maybe more police brutality in the beginning of the strike could stir sympathy from other unions and cause a general strike? If so, I think the Conservative govt could probably fold. It's one thing when you have some thousand miners protesting; an Arab Spring-like situation is on a whole other level.
Was Thatcher popular at the time? The little I know about the time and place makes me think she wasn't, but then again the Falkland's War isn't that far back so it could be higher.
I think this is still rather difficult to achieve; Thatcher was already a divisive figure by 1984, but she still had enough support to comfortably win the General Election the previous summer. Whilst you rightly mention that this was partly due to its status as a 'khaki election' following the victory in the South Atlantic in '82, one must remember that Thatcher was originally elected on a mandate which included curbing union power - this was something that resonated with a population that had grown used to rolling blackouts, heat shortages and other deprivations thanks to excessive union power. Indeed, as late as 1979, plans were being devised to use the Royal Navy to perform mass burials-at-sea following a gravedigger's strike, whilst soldiers were fairly regularly forced to replace striking firemen. Against this background, the general population - barring students, some other workers (espec. railwaymen) and the hard left (the Labour Party only paid lip-service to supporting the miners) - was broadly in favour of strike-breaking at the time. Indeed, there will have been many who will have been happy to see
more police brutality around the pitheads.
With regards to the idea of an 'Arab Spring' type affair, it's worth noting just how different the worlds of 1984 and 2011 were. Effectively, the state had, if not control, then certainly the support of the BBC and the Murdoch Empire, which provided most of the country with news (this dovetails with your earlier point on police brutality - there were allegations that the BBC switched the order of footage of the Battle of Orgreave to show Police charging at miners in response to being pelted with missiles, whereas in reality, it was claimed, the exchange happened the other way round. If such 'police brutality' was to occur, there's no guarantee that people will hear about it through the mainstream media; the
Socialist Worker etcetera made these allegations OTL, and no-one really took them seriously*) There is obviously no internet, nor any other viable way which independent, grass-roots revolutionary action can take place (arguably, the 'flying pickets' represented a primitive version of this, and they were basically harassed by a near-militarized, centrally governed, well paid and motivated police force until it became untenable), nor really is there the will for it. The other unions had basically seen sense and realised that they were not going to 'win' this strike, a feeling reflected by the TUC's absolute refusal to call a General Strike - given the levels of feeling and anger provoked by OTL's Miner's Strike, it's rather unlikely that even further levels of hostility could have changed the congress's decision.
Even if a General Strike was to take place (which is perishingly unlikely), a similar scenario to 1926 will unfold, whereby volunteer labour (like the OMS of 1926) and the military will be used to fulfill essential services for as long as the strikers can hold out. Thatcher's government was effectively the most hardline British government of the 20th Century, almost entirely as a reaction against union power - if it comes to a confrontation, it won't back down until it has exhausted every available means of beating the strike.
*Allegedly, the Police were trained to shout 'Camera!' every time such a device was spotted (again, cameras were still pretty big and obvious at this point - every mobile phone on every person wasn't a device capable of gathering evidence) at which point they were to stop whatever 'robustness' they were engaging in until the camera had been retrieved and the film confiscated (and often the camera smashed for good measure). I've asked some of those there about this, and all of them claim that this is little more than a fabrication.