how long would it take move all UTXO's over, assuming there are no other transactions to process?
46million outputs
http://statoshi.info/dashboard/db/unspent-transaction-output-seton average equates to about 18million transactions
if every user voluntarily moved their funds (including the oldtimers and satoshi)
if every block was filled with ONLY the 'opt-in' to segwit (average native tx to a segwit tx)
AT BEST. 2 months of constantly filled blocks just to pay themselves just to 'opt-in' to segwit