NO reason to upgrade - if anything, good time to downgrade!
Why would anyone want to upgrade to the new higher speed tiers? Unless you just like to waste money. They are all capped the same - there is no point.
I would rather convert over to the business tier at a slower speed and have no caps.
Here we are getting excited about 50 megs when China has had 100 meg to most areas for years - and much cheaper!