I predict a heavy drop in sales after a few months. That is because new players would have already missed out most of the online seasonal features (like the fia championship) and the game and save requires the servers. That means, that if you buy the game a year after, it is one less year of life for GTS and less a year you can play it. (PD kept GT5 servers for about 5-6 years and I'm praying that they keep the GT6 servers running)
Also, it makes me sad that this game format is being so well-received. I hoped for a massive flop, so that PD would open their eyes and would do things properly next time (for example, I don't mind having 150, but I do mind having all those VGTs and same type of race car). But guess, it's only me.