Speed. High speed trains clock in at 300 km/h, whereas maglev takes you to 600 km/h.
I agree with the above commenter, the EU needs to streamline passenger rights and international connections first, like they did for airtravel, but once that is taken care of, the next step is connecting European capitals on high speed maglev with very few stops.
To give you a sense of what such a transportation system could achieve, you could go from Lisbon to Kiev in 6 hours and a half at 600 km/h. If capitals served as country maglev hubs, we could do away with intra European flights altogether and cut a significant amount of flights to outside of Europe by concentrating the departures.
You could then have a hierarchy of sorts where maglev serves traveling between capitals, high speed between major cities within countries, regional between regions of smaller sparsely populated towns and local trains within cities or between close cities. Ideally if a passenger wanted to travel from a small town into another small town 3000 km away, the service should book all the appropriate hierarchy changes in one ticket.
The issue is that the line would have to be pretty much straight or have very shallow curves, due to the speed, so it would take a TON of land buying. That's complicated enough as it is without even considering the NIMBYs.
I'm no anthropologist or anything, but I'm pretty sure the annexation of the West Bank would guarantee a permanent guerilla terrorist force operating within Israel's borders for the foreseeable future. Israel would never know peace. In 200 years they'll probably still trying to snuff out terrorist cells constantly killing civilians.
Just with this war they have created thousands of fresh new volunteers for Hamas both within and outside the general area of the conflict.
The way out of this is more empathy for the Palestinians, not less.