There were some fundamental issues with the Christian elements of Europe that made revanchism challenging. For one thing, the north-south divide in Christian Europe meant they were fighting themselves more than they were focusing on the Muslims, and a lot of that was chalked up to the Franco-Norse progenitors of the House of Rollinger taking over Francia and creating a north-south split. Look at how many European wars involved Rollinger Francia, Germany and Angland on one side and Occitania, Italy and the Balkan Slavs on the other, with Hungary constantly playing wild-card. For another thing, after a point, the southern powers were at a numeric disadvantage once the north figured out how to make the most of the heavy clays in that part of Europe, but the Italians in particular were rich enough to hire the Berbers as mercenaries. They ended up getting comfortable with the Umayyads - and after a point, the real power in Iberia, the Hammudids - and the Emirates of Kalabriya and Siqiliyya, simply because Berbers were pretty effective fighters, saying nothing of the lucrative trade with Ifriqiya and Al-Andalus.