Doesn't it ultimately come down to the same thing? So far, one could sneak in the renewable share with solar thermal energy, but at a 65% quota, that will hardly be possible anymore and won't be economical either, since 65% clearly requires integration into the heating circuit, instead of just heating domestic hot water as before. Hybrid gas/heat pump? At least in new buildings that's nonsense, maybe something for existing buildings so that you don't have to convert to low-temperature (surface) heating. Although pure heat pumps have already improved even at high temperatures.
So in new buildings, the heat pump is certainly always the best choice, but for old buildings, which are mostly affected, there are indeed a few alternatives to the heat pump. And here I would definitely see pellet heating. For this, you don't have to turn the whole house upside down (but you do need space in the basement). A combination of a small heat pump with gas heating is also conceivable. Of course, you can't reach 65% with solar thermal or photovoltaics, that's true. Unfortunately, there is simply no really good solution if you don't want or can't do a lot of remodeling. I once considered pellets a good idea. But when you then hear that pellets are often dried with gas or that forests in Eastern Europe are cut down for this purpose, you somehow lose enthusiasm for this option again. Not to mention the horrendous costs that each of these solutions causes.