Yes, but that is part of the experiment. I found lowering the pop cap to be easier than burrowing and smashing migrants every season, though.
The idea was to create a self-renewing population of dwarves that do not rely on migrants. I've never played a fort for more than one generation of dwarves, so I think it's an interesting idea to try to create a standard fort without migrants.
Something to try for the next attempt:
Before you unpause with the first 7, select the 4 that you want and force them have the flags for heterosexual marriage. Built up a huge stockpile of food/spirits and let them idle for a while. See if that does the trick.
In fact... I may go do that right now...
UPDATE:
Experimental Setup #1: No partying setupEmbarked with 7 dorfs and a huge compliment of food and beverage. Checked all their flags before unpause. 4 of the 7 had singular, heterosexual marriage flags enabled right out of the gate. Of the other three, one was bisexual with romance preference and no marriage desire. One had heterosexual romance only. And the last had heterosexual marriage and homosexual romance. The three with mixed flags were romantically disabled to remove them from the pool of prospectives(sorry guys). The other four were untouched.
All units were also checked for pre-existing romance or marriage. None were found. 1 friendship existed between one of the breeding stock and one of the non-breeders. This was assumed to not be an issue, but it was noted for tracking.
I set up a specific meeting area for everyone to go to (just in case the wagon is insufficient as a meeting area).
At this point, the game was allowed to run with everyone idling. I checked in from time to time to see how things were going.
Observations:After 1 season: no new friendships or relationships of any kind.
2 seasons: no change
3 seasons: no change
1st year: no change
6 total season: No new relationships. (at this point, the fortress ran out of food).
Also of note: There were social skill gains, but they were miniscule; indicating that there was a minimal amount of actual socializing going on.
Possible explanations:1) No relationships are allowed during the first year (Unlikely)
2) It takes longer than 1 year to form an relationship (possible, but unlikely)
3) Relationships only form when idling underground (Very Unlikely)
4) Relationships cannot form in an activity zone, but rather need a statue garden or dining room set to meeting hall. (Somewhat likely)
5) Relationships only form during parties. (Highly likely given the social gains we see at parties)
6) Relationships only form when the fort is actually active. (Possible. If social gains are only made at the start of socialization, then high turn-over of the idle population may increase gains by allowing more instances of short social interactions).
7) Relationships only form when in a room above a certain value. (Possible. It may be that happier dwarves socialize more often or have bigger gains.)
I'm going to let this experiment go until they completely run out of food (another year, possibly 18 months), then move onto the second one: testing underground meeting areas.