Amclass: Do we have strong indications that the wishlist entries really do anything? I feel like emailing developers like stated earlier in this thread might be a stronger move.
The community wishlist entries are basically opium for the people.
It gives some of us the feeling that we can actually do something to get games released here, but that's a fallacy.
The rights holder alone decides
(in concert with GOG, of course) whether a game gets released here.
And the number of wishlist votes plays only a marginal role into that decision
(if it plays any role at all).
And of course: you have to differentiate between rights holder of new games, and oldies.
In the latter cases, there may not be
one right holder anymore, but several, who all would have to agree to conditions, under which they allow a GOG release of their IPs.
Not to mention all those IPs, which are stored away in some assurance company's basement, unbeknownst to those companies themselves because they acquired some (old) gaming company's IPs, assets, etc, as part of a whole batch to pay off credits, etc, when that company closed shop.
And - even if they know about them - that doesn't mean that they have any interest in setting foot in the software market.
And apart from that: GOG has to find out first, who holds the rights to these old games.
So, no. The wishlist is not really doing anything
(despite very rare claims of the blues to the contrary).