Whoa there. Nintendo has long ways to go on changing their e-shop policies before even considering other mobile platforms. Them offering their old games on other mobile platforms requires them to make a leap to an account system instead of the games being tied to a machine. Phones get replaced quite often and I would bet that someone could lose or break their phone within one year of purchase from Nintendo if they did this.
As it stands now, they can all of the sudden offer steep discounts on their games in their e-shop but even then I'll have a tough time buying it from them because if I brick my 3DS XL, I'll have good chance on losing my digital games.
I'm quite sure Nintendo will survive to Gen 9 but before then... they need new management or at least a new direction. I understand they want to be the alternative to the big two but they went way too low and they hold onto some outdated policies/practices. Diehard Nintendo customers will be diehard but I'm not one of them. I didn't buy a 3DS XL for Mario, Zelda and Pokemon (Hell, many people probably are not). Combining with the DS library, the 3DS has a huge library of games (Mainly JRPGs) I would play. The DS games I'll have no chance finding new from a retailer and if they are on the e-shop I would hesitate buying it from there. Similar thing is going on with the Wii/Wii U and older though the Wii U is an entirely different beast with other sets of problems. Me purchasing a Wii U is a big maybe since the Wii U is in a far weaker position than the 3DS.
I guess what I'm trying to say is that one: they need a far better e-shop policies, selection and prices (Wii U and 3DS). This won't carry a system but it will only help strengthen it. For the 3DS, it could be a goldmine.
Second is for the Wii U only... stronger hardware, stronger everything. I'm sure Mr. GOH can tell us everything. At this point in the console scene, the Wii U feels like nothing more than a knockoff brand by Nintendo. While I don't consider the Wii U part of the Gen 8 console war but I would rank the Wii U a bit higher than the X1 just for the fact it'll have different games but even then it'll be a tough sell to me.