Aim at the core audience, make their hardware easier to dev for, keep the free online play since that's always a great incentive over having to pay for online over on PS4,XB1 and 360, try courting more 3rd parties, hell even try merging with the 50 mil 3DS base since that's currently bigger than all the other consoles (besides PC).
I wouldn't suggest trying to be exactly the same as PS4/XB1 though, it makes me wonder why should I buy theirs if everyone else is doing the same thing with only tiny minimal changes, I'd rather go for what Ninty does best and having quality games that work instead of being broken on day 1 or having huge downtime issues is something that puts me off entirely when it comes to PS4/XB1.
Also probably try making it a bit more cheaper than the current gen prices along with not trying to force a tablet pad, try going for the regular Ninty gamepad approach and make more games with interesting mechanics and innovations instead of centering it around just the gamepad itself.
Mankind, in its arrogance and self-delusion, must believe they are the mirrors to God in both their image and their power. If something shatters that mirror, then it must be totally destroyed.
