These are very wild estimates
The opportunity cost of mining 1 INT with a 1070 at the moment (diff 67M, reward 1882, $0.10/kWh) is
28 sat compared to ETH/SC dual mining. You can earn 53900 sat worth of ETH/SC per day or you can mine 1720 INT. 53900/1720 = 31 sat less electricity cost around 10% (market price does not have electricity cost) => 28 sat.
If it were to trade today I think the starting range would be
25-100 sat.
Now, the end goal is a project comparable to SIA project. The total market for VPN is similar to storage ($50B), and the competition from other vpn coins seems similar to competition among file storage coins. If the devs deliver a quality product this may result in
4000-5000 sat range per INT ($0.20) about 2 years from now if we translate SC price to INT. The market cap for all 1B coins would be $200M, same as SC market cap. Obviously not all coins will be minted but most of them in the next 2-3 years.
Incidentally the core team will hold 100M coins worth $20M. From my point of view it looks like a worthy goal to keep going and not dumping on the market, so I am glad they reserved a lot of coins. They cannot dump it without crashing the market because the emission is slow enough to keep their share being sizable for a long time. However 2-3 years from now the market will grow and with a quality product they may be sitting on a small fortune that can be redeemed.