You may be underestimating the extent of geothermal power production that already exists around the world. For example, California's Geysers[1] and Salton Sea[2] geothermal complexes are some of the largest in the world, generating more electricity than all of Iceland's geothermal power plants combined.
[1] https://en.wikipedia.org/wiki/The_Geysers
[2] https://en.wikipedia.org/wiki/Imperial_Valley_Geothermal_Pro...
I think you underestimate the scale of geothermal available. The US is the largest geothermal power producer in the world though no one thinks of the US as that. Not coincidentally, it also sits on top of the largest high-quality geothermal basin in the world, essentially the entire Mountain West.
The US barely taps these resources at all despite leading the world. Ironically, much of the pushback on developing these geothermal resources in the US comes from environmental activists.
I understand people see this as an underperforming investment but I instead see it as de-risking.
I do think geothermal has a part to play, specifically for heating and cooling of neighbourhoods and multifamily developments. The construction has to move a ton of dirt anyway, so might as well install some ground loops while you're at it. If you're forced to drill due to site conditions, the load is lower than pure electricity generation meaning the wells are not that deep. For private homes it's far too expensive to be much more than a curiosity, but amortized across a whole new neighbourhood or collection of apartment buildings it's very affordable. Especially in northern climates accessing the consistent ground heat source/sink that allows you to run heat pumps at max efficiency all year is a huge win and is a huge amount of electricity you never need to generate in the first place.