In general A few Professions had more affinity with dual then others but that is long gone since the Weird QL vs Requirement stepping from 99 to 100 and 199 to 200 with AI weapons. That should be fixed. So should the SE AI weapons. About 1k in MM, MR would be fair, first upgrade Xan Pistol and 1HB at least 1250 MM/ MR. It's not that high and doable for any paid toon. But it will hurt more, you will need to consider it, or will need you to twink better instead of simple slapping on 2 weapons. Minimum fair price for "almost" endgame stuff. At endgame
I've seen a lot of combinations that will still be possible after this, and some be harder or not possible any more. And I still not see this as bad for the game. It will need people to rethink there set-up, there combination and other new challenges. If real problems arise at the lower TL level's there could be some tweaking, as nothing is static. But imho for the Endgame range the higher req for MM or MR should the check.
For instance, Advy could be getting a Jobe pistol upgrade for suitable PvM at endgame, with the MR req of 2k. Possible and hard enough on the IP. Therefore I happily trade in something else...
As a solution for all the set-ups that are now around. Sure they can stay, there still a few Doc's with that Agent only rifle around. But one thing that might change a mind is simply to put an OE check on MR/ MM as well. It will simple be OE at X given % and for both weapons, same as any other weapon req..