surprisingly, the initial update to allow you to DL the web browser did not block the acekard 2i. As to if nintendo will do like sony and put out a bunch of updates to thwart hackers is yet to be seen. If anything, nintendo might look at Sony's FAILED attempts to stop exploits and chill out, or they might try. It's up to Nintendo. as for exploits. we can hope there's a hacker like Dark Alex around to try and compromise the firmwares or even create customs, at which that may be in the form of using the SD card and a specific game (for the PSP fats, you needed an original GTA:LCS UMD and some stuff on the memory stick duo to hack it). So to answer your question, it's up to NINTENDO to decide if they will wage war against hackers and put out frequent firmwares to hack the DSi, it is up to hackers to exploit the firmwares and possibly create custom ones to add non-nintendo features, and AceKard will likely sell as many of the 2is as they can marketing them as "DSi Compatible" until the day when firmwares look them out. But AceKard will not likely get into exploiting/hacking firmware, the 2i chip merely had a HARDWARE build in it to make the current firmware of DSi believe it was a legit Game itself (the only real difference b/w it and the other DS carts).
That's my 2 cents that ended up looking like two dollars worth.
cheers,
Rh0gee
PS, the ACEKARD 2i works just fine w/ the DS and I don't think it cost anymore than the rest, so if you are like me and have both the DS and the DSi, go ahead and buy it and enjoy while you can and if it gets locked out, put it in the DSLite. but don't fear, someone always figures out how to compromise consoles, ALWAYS.