It's not a matter of when sales of Android handsets will surpass Apple, it has already happened:
http://online.wsj.com/article/BT-CO-20100510-713162.html
Now this is from the previous quarter, prior to the launch of the iPhone 4. Although even with the impressive sales numbers we're seeing, it wont be enough to keep Apple rising indefinitely in a rapidly expanding market. Every other manufacturer is fighting for a piece of the smartphone pie. Apple might be able to move 10-15M iPhones in a year, and it is true that HTC likely can't match those sales of a single model but they can release numerous models each selling 1-2M units. Add Motorola, LG, Samsung, Ericson, Asus, Dell, and virtually everyone else doing the same and it's not hard to see why Android will win out in th end.
Apple is heading for a repeat of their early days competing against Microsoft.
You are missing the point. Android sales are spread over numerous manufacturers. There is not one that is profiting and generating sales, per handset, like apple is. Look at all the handsets that have already been sunset, the Eris for example. Also the point is not HTC, in fact they are the only ones that are directly benefiting to the new handsets more that anyone else. To many people on the food chain, HTC, Motorola and VZ. There is not one company selling a single model handset that will match apple in either volume or profit.