The structure is, basically, if you win elections - either for legislative office or for party office - on the local, regional, state or national level, you control the party; and, to a certain extent the structure.
If you can't win elections on these levels in the GOP with your people or manage them effectively when you do, you can't do with a new party either. It's the same tasks, skills, people. Anybody can build a party comprised of their kitchen table. Growing to a size that controls legislation requires greater skill.
What's harder is doing it from scratch when there's already a structure in place, ballot access, assets, systems, etc. etc.
I sometimes wonder if those that complain about the GOPe have ever participated in electing their local, regional and state party enough to understand that this is what the party really is - not some nefarious 'them'. Are you aware of this?
“Are you aware of this?”
Yep. But the local GOP wouldn’t likely support gun control, gay marriage, or someone who would create socialized medicine in a state. I’m also aware that the GOP-e is a network of people who owe each other money and favors, possess access to power, and promote their own creatures wherever opportunity presents itself- and that they don’t give a damn about conservative ideas or values. That apparatus either has to be erased (working within) or worked around (new party). The former appears not to be working. It is time to start looking at the latter.