I would love if there were higher tier subscription services. There are many possibilities on what they could offer. On the Microsoft side things are easy, MS is probably the one to innovate the most here, they could combine GamePass and Gold into one sub, and Sony could follow and bundle PS Now with Plus at $10-15 a month, especially now that PS Now is basically GamePass with streaming. It'd be nice if they bundled Plus, Now and Vue into one big mega sub.
But what I also want, are bigger benefits in the PS Store: deeper discounts. Imagine a PS Platinum sub that makes every game on the Store -50%, even (select) pre-orders? Paying $30 for new releases, that's how I'd convert to the digital future. Make me pay for discounts!