I haven’t played the map (or Tremulous in general) since the BP was reduced, but I see absolutely no reason why it could not be just 100 BP. If it’s a map in rotation 2, with some already insanely good base locations, 140 BP is definitely still too much for a map that is in rotation 2.
My opinion in this situation is irrelevant, since I am not one of the 15 people who still plays Tremulous.
No, it promotes making even harder to kill bases with the 140 BP. Extra BP will never be enough to encourage building forward bases. GPP did a great job of promoting small forwards with the change to Repeaters, but in 1.1, increasing the BP just makes bases stronger and harder to kill.