I am fine with the idea of 1 durability ships and module changes. I always thought crafting and economy end of the game needed some help...it certainly needs some tuning.
With the coming wipe of ships and related changes perhaps it is time to reconsider how ranks work. I would propose that the current rank structure be scrapped. The only purpose it currently serves is crew size. Perhaps a better way to structure ranks is to have a 2-tier system.
The first tier would be tied to experience in a particular ship (as the dev post seems to imply is happening). Ships themselves don't change, but an experienced captain and crew can get the best out of a ship. I would suggest 10 ranks per ship with each rank giving a very small incremental bonus to crew related stats as you go from rank 1 to 10...say 1% per level to gunnery and handing abilities. These would cap at 10% at rank 10, but would be further boosted by refits/modules to customize a ship. At least newer players won't be totally outclassed and given luck and good handling and gunnery may very well win some fights against a more experienced captain in a similar ship. Ranks should be gained at roughly the rate of 1 rank per 2 victorious combats vs a similar BR opponent (perhaps even 1:3, 1:5 or 1:10 if you want to make it a bit more of a grind time-sink)
The second tier would be tied to ship ratings. Once you achieve 10 ranks in any combination you are rated competent enough to move into the next rated class of ships i.e. 2 ranks in a lynx, 3 ranks in a cutter, and 5 in a pickle allow you to move up to 6th rates.
Crew sizes of course would be tied to the ship and not the captain's rank and something we would never have to worry about. Crew sizes would only vary if you fitted an upgrade/refit allowing it. I do, however like the idea of having to medkit your crew or buying replacements to bring the ship back to full strength once in port.
Fleet ships...I am torn between eliminating them as a hassle or allowing you to take 1 smaller fleet ship below your currently rated hull...so a captain rated for 6th rates could have a 7th rate in his fleet....someone rated for 3rd rates anything from 4th to 7th.
As for the other two announced changes: The server merge and PVE zone seems reasonable. The port building economic control changes seem like a train wreck waiting to happen.