BTC should NOT be an alternative to NMC for the purchase of services intended to be under the NMC flag and if allowed to continue, will render NMC (as a currency) a complete and total failure.
BTC is a currency. The purpose of a currnecy is to buy and sell goods and services including among other things domain names.
Hopefully someday you will be able to register a dot bit domain w/ BTC, USD, Euros, and twenty other currencies VIA INTERMEDIARIES.
However behind the scenes NMC is still needed. It is impossible to create a dot bit domain registration without NMC. Given unlimited USD, BTC, or other currencies you simply can not add a domain to the NMC block chain unless you find someone with NMC who is either willing to sell you some NMC or do it for you.
A site offering domains in BTC is no different than an exchange allowing trade of NMC for other currencies.
Exchange:
1) Person has BTC
2) Person wants dot bit domain
3) Person exchanges BTC for NMC
4) Person uses NMC client to register domain
Registrar accepting BTC (or USD or Euros, or eGold, or blood diamonds)
1) Person has BTC
2) Person wants dot bit domain
3) Person pays registrar in BTC
4) Registrar uses NMC (already acquired or purchased in realtime from exchange) and NMC client to register domain.
Your rant makes about as much sense as saying.
"I saw in the mall you can buy gold coins w/ dollars. Dollars should NOT be an alternative to gold. If dollars can simply make gold coins then gold is useless and a complete failure."