More trails off the top - mega mental DH stuff, maybe freeridey 'shore' type trails and more Glentress-esque runs (a massive blue grade BBB all the way from the top of Inners would put a reet grin on my mug) etc etc and maybe access to more XC trails heading south from Innerleithen and maybe west towards Peebles and Glentress.
If there were all these options I'd happily pay £20 a day to have a gravity assisted fix despite not being averse to climbing (especially Inners which I really like as climbs go).
I've never felt the inclination to go on an uplift day but like someone else said, one of the big advantages of a chairlift I could see from a rider experience point of view is that you jump off the lift and straight into the trails where there shouldn't be a massive queue (unlike a bus load of people all piling into a trail together).
Another thing that'd be needed would be supporting infrastructure. A better car park, bogs, cafe, shop etc. I know its a flood risk where the car park currently is but there must be more suitable locations...