Re: What possible delay?
"and the election which wiped out the EU supporting party"
Bullshit. Neither the conservative or labour had a solid position on EU/Brexit at the last GE, and they aren't clear now. Labour is still fudging it, last I heard they want a customs union, which crosses pretty much all the leavers red lines (have to follow EU laws, abide by ECJ rulings) so I'm not sure whether they are pro or anti EU, but they certainly aren't what most leavers want*.
The conservatives have managed to negotiate a Brexit deal which they can't get passed by their own party, let alone cross party. So again, no idea if they are pro or anti EU since they can't actually agree what they want, let alone what they can negotiate as a party position, government position, let alone as a country.
"But this is the problem with the remain argument."
Other than it's the status quo?
My argument for remain is that it is a complete proposal. All the current systems support it, and there are plenty of things that the leavers want** that the UK could do while remaining part of the EU, but won't (*cough* immigration *cough*). I think drawing attention to the things that are going wrong with the EU is a good thing (whichever side you're on), but Whitehall has spent decades hiding their own incompetence behind the facade of the EU.
As an example DEFRA is unbelievably shite on making payments, so despite the farmers doing their paperwork, the EU paying DEFRA out, British farmers still get paid months after their EU counterparts. So British civil servants being incompetent at doling out EU money is somehow an EU problem. If only the EU was a federal state and could sort out the British civil service, but it turns out that all the EU members are in fact sovereign. Well, sovereign in legal terms, I'm sure there's some other definition :)
If and when I see an actual proposal from the leavers, rather than empty promises, then I'll listen. One that is based on a) the current situation and b) things that are available now would be nice.
Mind you, it would be pretty funny if other policies were allowed the "creative freedom" that leavers utilize. Then we could have a defence debate on the merits of the Royal Navy using laser armed sharks versus powered armored marines. Or energy policy, where parliament can declare that nuclear fusion will solve all our power supply needs, and that it will be available in six weeks time....
"Very few (and I appreciate discussing with them) seem to argue sensibly on fact."
I found that using facts in a debate with leavers is asking for a fight. It's pretty clear that most have a decided position, and it's not based on facts and logic. This is the norm for most politics, and why the "informed voter" is a myth.
* I recognize that identifying what leavers want is very hard, since it's mainly about what they don't want, and that most of the time those "nays" are contradictory. Or undefined. Or are words that means something different to them than me.
** and aren't wrong about, IMHO