For those who need inspiration, let's consider two stocks that have been trashed this year but still boast solid, long-term prospects: Tandem Diabetes Care (NASDAQ: TNDM) and Roku (NASDAQ: ROKU). In the next decade, Tandem Diabetes Care can count on its disruptive innovations and the increase in the number of diabetes patients to deliver outsize returns. The company's t:slim X2 insulin pump is much easier on people with diabetes than multiple daily injections (MDIs) and Tandem's product provides features that most don't offer, including continuous glucose monitoring integration to automate the insulin delivery system completely.