Now obviously the game will then be balanced around the idea that Protoss needs this extra gas in the same way Terran needs mules, and here's why I think it's a good idea:
- Baiting photon overcharge will actually hurt. You baited an overcharge? You deprived gas income, much like forcing a scan it actually costs something. Currently the core is often hovering at 200 energy doing nothing.
- At 50 energy, it costs less than photon overcharge/timewarp, this means that an attack must be anticipated to be defended by it. You have to save your gas-mules if you anticipate an attack to be totally save and cut opportunity cost, the mothership core will only save you if you were mindful enough to anticipate it.
- Bringing the mothership core along with your army will deprive your gas income now. If you want a recall/timewarp you're basically paying gas-income