The impact on the GOP-e is nothing when you register I, in most states you will not be able to vote in either the D or R primaries. Cconcentrate on your local R candidate's by staying registered R, it's the only way to purge the Rinos out.
No, it would make the GOP run people whom would bring out the vote (and the funding, that’s #1).
It currently matters not, since the GOP presumes all votes belong to whomever they foist as the flag-bearer