The short answer
Yes for buyers with a five-year horizon who buy land on the Panvel corridor or a rentable farmhouse near Neral. No for anyone hoping to flip a scenic plot in eighteen months — that trade worked in 2021 and does not work at today's entry prices.
What the airport actually changes
The Navi Mumbai airport shifts the entire Raigad catchment's centre of gravity. Karjat is 45–62 km away depending on the village, which puts it firmly inside the weekend and staff-housing catchment without putting it in the immediate speculative zone that has already repriced.
The practical effect is steady demand rather than a spike. Price your expectations accordingly.
Where we would put money today
Acreage at Vadap with a plausible NA conversion path. Value plots at Kalamb. A well-located farmhouse at Neral bought for yield, not for the view. In each case, buy only after a 30-year title search.