Will we ever see Pacquiao throw 100 punches in a round again

He tends to only unload when he's hurt or angry... something that hasn't happened in a long time.

If he fights somebody who comes forward or stands in front him : yes. this ^^ another margarito, clottey type opponent and he will. but if hes fighting guys who can box, move and give him angles they wont allow him to just let his hands go at will.

yes if he fights clottey or margo again... ow. margo retired already.. but even if hes on the downhill, he kicked bradleys ass easily.. and that was a prime one.. the king of 140 they are saying.. and obviously bigger than pac too.

Doubtful his ring age and lack of serious training will prevent this from happening

If he fights somebody who comes forward or stands in front him : yes. Quoted for truth...

If he fights somebody who comes forward or stands in front him : yes.