Look up the model number on google and youll see if this model has a particular failure mode. If your handy and out of warranty you can get it fixed.
If you boutpght 100% of it on a mastercard or visa (no partial payment with gift cards etc) they typically double the warranty to two years. You might want to check with them.
Some models have problem but yes, in general consumer electronics are not desiged to have indefinate lifel like long ago. To reduce cost, they are pushing fewer, smaller and cheaper parts to the limits. The expense is reliability.
My 2008 panasonic 58" plasma died after two years and a few months.
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. Being a sparkie, i opened it up and bouht replacement boards from ebay until i found the ine that was damaged. Took three tries at about $50 each but for $150 i got a then$3000 tv working again. One little transistor that should have a heatsnk but didn't and it was getting too hot to touch. I added a heatsink fin and some thermal goop to get it down to reasonable temps. On a high end tv they still cheaped out.
Thankfully, Its been working since with heavy use and no issue.
All the major brands are about the same in this regard.
You might consider Costco and their gold plated return policy for your next one.
. Being a sparkie, i opened it up and bouht replacement boards from ebay until i found the ine that was damaged. Took three tries at about $50 each but for $150 i got a then$3000 tv working again. One little transistor that should have a heatsnk but didn't and it was getting too hot to touch. I added a heatsink fin and some thermal goop to get it down to reasonable temps. On a high end tv they still cheaped out. 
