Does stock-market interest matter to apple?

So, apple just sold a record number of iphones. It is the biggest company in the world and has yearly profits in the dozens of billions; it has billions in assets, and it has billions in cash. It is doing great and, even if you believe it has lost its edge, then more likely in a few years it's going to look like microsoft does today, instead of actually going under.

all right. But all the market sees is that growth is slowing down, so people looking at whether to but the stock figure they're unlikely to double their money on it (that would mean a 1-trillion dollar valuation).

my question is: what if it is over? What if the best apple can do is to keep realeasing iphones, and the number of iphones sold becomes stable, and it remains a company making profits in the billions every quarter, and with no debt, and with a lot of money in its coffers, and nobody wants anything to do with its stock?

what does that actually mean? Does this matter to anyone other than the people speculating on apple's valuation? Will apple's buildings disappear at one point because of this? Will their 140 billion in cash become negative?

can apple just say screw it and go about its business and making billions? The market is hysterical by nature because it's continuously looking to hit the lottery, but can't a company just have a great business and be oblivious to it all?

Because they have so much cash it is unlikely they will ever lose money, but Apple stock is at a very high value right now based on their expected future earnings. If it was valued on everything just staying the same the stock would be worth a lot less.