Not necessarily. It depends on what the remainder would buy. If you intend to buy one, that speaks for itself, and "3-5 "being AT LEAST 3 and 'more than 5' being at least 6 these are the 'orders' from the survey
121s 320
As 231
071s 192
Cs 177
141s 155
201s 131
Nothing being certain in life but the 121 is on the way at some point "next up"
A's are also highly desirable which is interesting since at least some are available from SF, so either people want more of them or better ones.
The 071's are also highly sought after and presently on the market so will be purchased from existing stock unless modellers want even more diversity in the existing liveries/numbers.
C's are also fairly desirable just pipping more 141s.
141s are still sought after judging by this and since the are effectively sold out now there are likely to be modellers that will want to add to existing stocks or new modellers that will likely want them. 201s lowest on the diesel list but still available. Worth remembering that they are the only model that HAS had a new run after the old Limas.
Looking at the numbers in the survey, not one model up there would be worth producing due to insufficient numbers. These are responses from only 150 modellers and it's hard to know how far to extrapolate this data. Depending on that, there could well be an additional market for many of the models up there although the 121 and A are clear leaders.