Dershowitz calls this suit a “Hail Mary” pass: https://justthenews.com/podcasts/water-cooler-david-brody/dershowitz-tx-case-against-pa-hail-mary
Other legal options are needed.
This shouldn’t be the proverbial basket for all of the eggs.
This is the only route that gets you directly to the Supreme Court. Admittedly there is no guarantee that the court won't dismiss the case out of hand, or if it schedules oral arguments that it will side with Trump. It is a Hail Mary pass, but Hail Mary passes sometimes result in wins. Nothing else has gotten Trump anywhere near the field.
Dershowitz is a flaming libtard Democrap. He is smart, but he has an agenda. As such, I would be leery of anything he says on the subject of SCOTUS and Trump.