There are many options on the market, and while replacing your sets with a smart tv model is one option, that is not necessary.
For about $30-100 on a roku, roku4k, fire tv, htpc or smart bluray player and get all the same functions and many more, with better performance and lower cost.
Of these options, I'd recommend the fire tv, in either box or stick form most highly, followed by the roku.
If you'd like to discuss specifics on any of these, let me know. Either will ably handle netflix, hulu, amazon video, youtube, etc.
If you have any other questions, just let me know. Otherwise, please take a moment to rate my service using the stars at the top of the page; hopefully I have earned 5 Stars. I also invite you to contact me directly with any future support needs at http://bit.ly/1QwLxGh and ask for Nathan.
Thank you, ***** ***** a nice day,