I get your frustration, but I'm curious about something, if I may ask a question... Given the premise of an older Hank/Jan, if you had to choose one of the following options (humor me, and assume you can only choose one), which would you rather have:
1) Jan and Hank were active together in the 60's, and while we may get a few short flashbacks, we'll probably never, in all honesty, see them in a solo film, or get them into the rest of the MCU.
or,
2) "Hope" is a younger, currently-active Wasp (who happens to be a similar character to the 616 Wasp, in all but name and relation to Pym), but who has potential for appearing in future sequels, or anywhere else in the MCU.
Because as I see it (1) is closing a door to future stories, while (2) is leaving that door open.
Edit: Just to be clear -- I'm not denying the possibility that both could be true (and that could be neat), but if I had to pick just one or the other, my preference would be for (2).