Most of the content is already on the 3DS eShop.
http://www.nintendoworldreport.com/news/42427/dsi-shop-winding-down-over-next-year
The DSi Shop is about to enter its last days.
Nintendo has announced that DSi points can no longer be added to DSi systems as of September 30, 2016, with a full shutdown including the inability to download purchases after March 31, 2017.
Nintendo's notice recommends transferring the games to a 3DS, and the games will still be sold on the 3DS eShop - only the DSi shop itself is affected.
finally time for me to buy Mighty Milky Way.I really like this game. Might just be my favourite of the "Mighty" games.
So... What about remaining DSiShop point balances?
DSiWare had a very poorly designed shop front, but there were some very decent games available through the service!There's also Flipper and Escapee Go, the latter of which I will very highly recommend.
I would definitely recommend Alpha Bounce, Alt-Play Anthology (although this won't appeal to everyone), Art Style Pictobits, Dark Void Zero, Pop Island, Puzzle Quest, Shantae, Starship Defense, and Undead Storm - although it's a shame that last one didn't support download play for multiplayer modes.
Are all of those games available on 3DS eShop? Most probably are... I never really checked to confirm.
The version of Tetris Party Live that is no longer available was fantastic and priced very aggressively - shame it's been replaced by more expensive, but less well put together, versions.