Just going by logic we know exploit(s) still exist, and possibly kernel at that. I refuse to believe that TN is the only one capable of working with one at the moment which means that whether or not it's public the PSP will remain hackable for a while.
The PSP scene has been dead for over a year though.....just patching games and making firmware bolt ons doesn't indicate a burgeoning scene. Back in the old days when we had people contributing all sorts of things daily, that was the real scene. This today is just the long slow drawn out death rattle. And whilst i'm no developer, i'm certain that the PSP hardware itself isn't that underpowered so as to why there was a sudden loss of interest by EVERYONE, i find immensely sad.
I've decided its the lack of profit that prevented more interest and development.
In the case of the DS, fixes and exploits are still being produced, spurred on by the sales of flash carts. If there were no more firmware updates and fixes for official games then sales would slow.
But there was never money to be made in the PSP because you jailbreak it then add everything to a plain memory card. Without industry as a factor, the scene is underwhelming because it depends on individuals selflessly working on behalf of others. The fact that somebody like Dark Alex ever toiled away was purely altruistic. And when there is a disproportionate number of unappreciative fools saying stupid things on the internet, it doesn't give one much motivation to contribute anything.
I submit that if the PSP had required flash carts since day one, we would have seen many more alternative firmwares with revisions continuing to this day. That competition across multiple products, with the intent to make money seems to be necessary even when we're ultimately talking about third party freeware.