Yes to 4.5, but with some heavy stipulations
First, leave the current obsidian recipes in the game as they stand, or even better revert them to 3.5. There is no reason it shouldn't still be craftable. A lot of people like obsidian and it offers some nice stat bonuses. However, at this point it should remain with the same stats as it has now, or if anything absolutely has to be changed make it easier to obtain and slightly easier to regrade, **OR** optionally maybe buff it by 5%. Meta choices are nice to have. Why ruin sandbox elements?
Secondly, leave hiram in the game. Does anyone at all remember the old Hasla grind? Not on *this* server because obsidian was already out when this server started, but I remember hasla. Literal ***months*** to get those stupid tokens. Obsolete with the obsidian patch. People moved on. I was forced into a meta I didn't necessarily like, but I viewed it as all things should be viewed: a stepping stone to the next great thing. Hiram is the next great thing.
Hiram is another new set of armor designed to fit with the new content. If we have nothing but the old armor we won't really be able to actively participate in the new content. In addition, it's new armor! New equipment is always a good thing. A lot of old hats are going to complain because "waah, I did all this work with obsidian and now there is something better" but they need to learn to let go. Crafted armor is far more difficult to obtain and regrade than obsidian because it isn't comprised of just throw away materials. It got slightly easier with patch 3.5 but really not by much, and the Archeum restriction gate that was introduced with the reduction of wisps makes things pretty much just as difficult as RNG meta anyway. Even trees for archeum are a hot joke, and produce next to no meaningful amount.
Obsidian armor as a whole invalidated a LOT of stuff, including for a large part crafted armor, and is largely viewed as BIS for many classes, however things change and evolve. People need to learn to adapt.
Third, undo the nerf to wave meteor. The continuous nerfs to already the WORST SKILLTREE IN THE GAME are disgusting and need to stop. Magic may have the highest skill damage % for the most part (except for concussive arrow from Archery), but it has the absolute highest time to kill and most penalties for choosing to use it. No resets, massive cooldowns, barely any CC, and long channeling times. Magic has *THE LOWEST* defensive penetration capabilities, and is all too easy to be tanky against. All the skill damage in the world means nothing if people in basic freaking leather can get 50% damage reduction without even trying. I have one of the highest int stats on the server if not the highest, and I regularly fight 2H darkrunners with *over 60% magic damage reduction*. XL Games is literally incapable of basic mathematics and has relegated a massively popular playstyle to the garbage can.
Melee is served absolutely everything on a platter, from GCD abuse capabilities to the lowest time to kill to the highest damage output in PvP scenarios and many more things besides, including the raw ability to abuse the poor network coding this game has without even having to try. Can we stop following piss poor implementation designs please?