While methane is worse it’s worth noting that it doesn’t stay the atmosphere for as long; so if we stopped producing the fall off in warming would be a lot steeper; so theoretically if we assume that eventually renewables will take over there would be an optimal ratio between the longer term but less damaging CO2 and the more damaging but short term Methane. But all that is driven by economics not science so ¯_(ツ)_/¯