LDs will never be big enough to get a revoke A50 majority in Parly.
Sure, but with the SNP, who I suspect could well move to straight revoke A50 themselves to fend of the LDs, that’s possibly about 100 seats in a new parliament, and its highly likely Labour would need one or both of them to govern.
Possibly the Tories would need them too, but as mentioned above, there are a fair number of one nation Tories who’d rather hold their nose and vote LD if it keeps us in the EU, and especially if it sinks the ERG nutters.
Bottom line is it’s like a QI question: nobody knows how this would resolve itself at the ballot box, particularly given the FPTP voting system.