The figures look great on display so I will not be boxing them up or getting rid of them...That is a lot of figures and a lot of characters. The only way I would replace them is if something better came out down the road. Which IMO would be hard to do.
I agree...I think my biggest frustration with the line and its hypothetical though probable ending is that the quality is so good and that it's hardly likely a comparable line would come along any time soon. So then I look at all these extra Kirk's and I see some new sculpts for duplicate characters (such as Mirror or All Good Things) and I think how much more I would have liked to see Quark, Bajoran Kira, and the Voyager Crew. They're cool...but no replacement for a complete set of crews.
I currently display the Enterprise crew, the TWOK crew, the TNG crew, the DS9 crew, then a shelf of aliens, and then the TOS crew and a final shelf with AGT and NEM TNG characters. They do look great...but sadly incomplete. I guess they'll have to stay that way.
I think if a 3 3/4 line pops up I will be very skeptical. I have never really liked that size because the sculpts are never really accurate. They don't have to be per se at that size. I LOVE some of the DST/AA sculpts...Ensign Ro is eerily accurate...and of course the Scott Bakula and other Enterprise scans are pretty cool as well. The 3 3/4 would have to be 24th century Trek and really good before I took the plunge.