That's a tough question Hevlet, everyone wishes they could pick the next apple. It's always going to be a gamble though...
Remember if Apple didn't bring back Steve jobs in the early 90's, then the company could very well be worth next to nothing today.... The point is there is so many factors in determining what makes a successful company, even if you get the right company, in the the sector- then the CEO and board could still fail to deliver...
If I were looking for a 30 year investment to forget about, Id look towards silver and gold bullion...Over that time frame they are very safe options, and still with huge upside.
