They will come back
No doubt about that... something which I agree as well. Probably when bitcoin has gone mainstream with more customers going to use btc, they will have no choice but to make available the payment option. Else, I see them losing the business to their competitors.
If you want to pay for WordPress with Bitcoin, it's still pretty straightforward:
1. Buy BTC with USD.
2. Sell BTC for USD.
3. Pay WordPress.
Easy peasy
How does you 3 steps imply about
If you want to pay for WordPress with BitcoinWell, if you mean that steps 1 & 2 could be omitted, sure. But when you buy things with Bitcoin, a few steps could also be omitted.
Can you spot which ones?
1. Buy BTC with USD, pay exchange fee/possibly get ripped off/robbed at gunpoint @LocalBitcoins.
2. Pay BTC to the payment processor
3. Payment processor sells BTC for USD, sends USD to the merchant.