2 years just for the servers? I don't think so mate. Maybe I'm the most pessimistic person here in this forum but even I don't think KONAMI will make the game F2P. They made a huge hype, changed the engine and said "taking PES to a whole new level", they couldn't have done all this to make the game F2P . Maybe PES 2022 Lite version will be there in future but I don't think they're gonna make the main game F2P.
One possibility you are not accounting for is that they dramatically over-estimated their capabilities early on. Things look very different when you suddenly find yourself a few months from having to release something. I predicted PES would end up f2p a year or two back, it seemed inevitable although I didn't think it would be this soon, but if the online beta was any indication of the progress they've made with the new engine then going f2p may be a way of heading off criticism, since it's hard to complain about a free game and they might see it as the only way they can justify releasing something to the public that looks a million miles away from what they promised. I still hope this is all a big reverse psychology marketing trick and we are going to be blown away on the 21st.