Virgin have already indicated that they are not prepared to participate in the LCC fare war that will occur when Tiger starts operating. Instead, they will compete directly against Qantas in the premium market leaving Jetstar and Tiger to lose money fighting over the low yield sector. This means that there are only two airlines competing in each of the two distinctly different markets.
Sunfish, from your posts over a long period of time, it is obvious that you hate Qantas so much that you would prefer a foreign carrier to have dominant market share and have all the profits go overseas. I don't know anything about your background but your loyalty to the country that has given you everything in life is severely in question.