Batteries are not a feasable seasonal storage. They can store for a couple of hours, no more.
For seasonal storage you need a hydrogen economy. H2 is very very expensive and has never been rolled out at scale. Not a single large gas turbine to burn pure H2 has ever been build.
In the middle of a crisis it's better to go for proven and economic technologies than trying to invent something completely new and untestet.
Those comparisons have been done and they always end up with an energy mix between hydro, nuclear, solar and wind - not 100% wind/solar.
It isn't enough to build solar and wind, you also have to build backup. This is currently done by coal and gas but in the future it has to switch to climate friendly sources of energy. A hydrogen economy is very very expensive.
Since airlines wouldn't be profitable without price discrimination of the sort that makes hidden cities and throwaway tickets possible, they won't just go away, when you post about it.
From the airlines' perspective those fares actually make sense. A direct flight should be more expensive than an indirect one, even if we are talking about the very same flight.
It's not a bug, it's a feature and here to stay...
For seasonal storage you need a hydrogen economy. H2 is very very expensive and has never been rolled out at scale. Not a single large gas turbine to burn pure H2 has ever been build.
In the middle of a crisis it's better to go for proven and economic technologies than trying to invent something completely new and untestet.