Even if the Lumia sells in the millions WP stays at less than 10% marketshare
Android sells over 850,000 phones officially (over 1 million a day counting Chinese variants such as MIUI and Xiaomei) which puts them on track to sell over 70 million phones worldwide a quarter.
Apple sold over 17 million phones last quarter.
Even RIM sold over 11 million smartphones last quarter.
Even if the Lumia sold in the millions they could never get near even iPhone numbers. Android activations are also increasing substantially quarter over quarter. I don't see any scenario where WP can get more than a single digit marketshare before Nokia runs out of money.