Yes he used 10,000 Bitcoin to buy pizza and I doubt at that time if he actually saw any future in holding Bitcoin, but we can not completely know because after that there was still enough time for him to get back on track if he actually wanted to do so.
The most important on that time is to make a milestone of purchasing tangible things with Bitcoin. His action pave way for Bitcoin adoption worldwide. About Laszlo Hanyecz view on Bitcoin, all we got is speculation since he never publicly express his view on Bitcoin, he even did not disclose his Bitcoin holdings. It is arguable whether Laszlo did not see any future in holding Bitcoin. It can only be answered by Laszlo Hanyecz himself.
Although it wasn't rampant for a pizza house to collect Bitcoin but in this case that was the situation. Deep down I will feel that it would be justification is that 10,000 Bitcoin was held by who received it.
The person who received the payment is Jeremy Sturdivant and no the 10k BTC payment were not held instead was spent since Jeremy Sturdivant saw the opportunity to participate in the growing Bitcoin experiment.[1]
[1]
https://bitcoinwiki.org/wiki/jercos