like i said nintendo closed dsi e shop you cannot redownload anything now, they annonced this is the last year for wii eshop and again no redownloads, wiiu e shop wont take long maybe 3 or 4 years at best, on consoles is even worst, when they close the shop everything you have is now gone, if your console dies or you deleted the title you can no longer download it.
so far it was original xbox,dsi and wii this year, in 5 or 6 years when they close ps3 and xbox360 shop you will see alot of people complaining, heck even dlc codes and such on ps4 games have an experation date of 2021-2022 so they have no obligation to mantain your download code after they expire.