There had bern case studies done on this, including one by AVIVA.
One predictable outcome would be that mass consumer electronics would be more expensive. However, mass manufacturing of lower-level goods (textiles, footwear, garments, furniture, household products) had already taken off in China in a big way even well before its WTO entry (I did a research study on this in university) and much of it was already being exported to the western world and was actually accelerating even without WTO entry, so that won't have matter much.
Part of the conditions of China's entry into the WTO was service sector was considerably foreign investment was to be considerably relaxed, especially in services such as retail, wholesale and distribution, with foreign banks and foreign financial services permitted to make inroads.
That means that without WTO entry, western consumer brands would have negligible presence in China, compared to OTL.
The biggest impact of China's entry into the WTO was the perception linked to the transparency of intellectual property rights. The misleading perception that the accession to WTO would mean IP rights could be enforced resulted in the wholesale of tech transfer of automotive technologies and semiconductor technologies to China by Western, European and Japanese companies, although there had been actual case studies where Japanese companies still did tech transfer in these fields even before China's WTO entry.
With regards to OTL's widespread availability of mass consumer electronics, what manufacturing was left in the Western world would still have transferred to the rest of East Asia, with South Korea and Taiwan retaining prominent role in value-added products, with the rest of Southeast Asia holding much of the mid-value chain. Labour markets and wages in the rest of East Asia would still mean manufacturers would offshore much if it out of the western world but it won't be as cheap as it was in OTL.
Source: I seen some studies done on this kind of hypothetical scenarios while in university.