Are you implying that all those stories about Apple surpassing MSFT's market-cap were misleading due to this fact?
Thanks
If you buy a stock as a dividend stock, you might not really want it to rise much, or at all, since you want those dividends giving out the increased value rather than seeing it reflected in the market cap; ie. you want the company paying out the results of expansion.
Given the expected substantial growth of per-capita wealth throughout parts of the developing world (e.g. much of Asia especially China, parts of India, much of South America, parts of Eastern Europe, etc.) and the consequent expansion of the population of the affluent, developed world the potential future market in the computer software/hardware/services industries is likely to be enormous. The companies that manage to cement themselves firmly into the future mainstream mechanisms for people to buy physical and digital goods online as well as the mechanisms for obtaining access to the online world will be well seated to collect substantial revenues from that expanded market. And Apple, Google, and Amazon are much better situated and seemingly much more capable of capitalizing on new forms of markets than Microsoft is. I believe all of that is, to varying extents, reflected in their respective stock prices, and I think it's a very valid view of the state of those companies.
As for the basic point here though. Yes, an investor cares about total returns so dividends can't just be ignored.
Since the comparative price of the stock would get adjusted to reflect this and market cap is a simple product of the price and shares outstanding, it does tangentially impact market cap (again, only for comparative purposes). Though a more direct way of stating this is that the value of the stock should be adjusted to reflect the returns from dividends.