Wrong. 50-60% of PS4s do not have PS+. Single player games are some of the best selling games on PS4.
PD have already rightfully said that GT7 will be a mixture of past, present and future GT. Having a great SP campaign is what most people want.
Yeah its clear, abundantly clear the PS4 has succeeded partly due to their strong portfolio of single player exclusives.
I think PD learnt their lesson when they released GT Sport without leagues and then they promptly added it two months later at Xmas and then, partly due to some of that, ended up selling 10 mil copies.
Its clear they will have GT Leagues back day one. I disparage PD a lot but I think they wont do that again.