Tanks just flat-out need a buff. They used to be the core Terran unit, but now they're nowhere near as powerful and have more counters in WoL than SC1. They just don't set the pace of the game as much.
Now in HotS, Zerg and Toss are each getting a new unit that hard counters tanks, with the Viper and Tempest. With all these counters in the game, tank play is going to be even weaker!
Current Terran play is all about the mobile, expendable bio balls. I thought the whole "fast, mobile army" was Zerg's schtick.... and it SHOULD be Zerg's schtick.
Tanks really need a buff, IMO, to make the units worth building even when Vipers and Tempest and Immortals are out on the field. Otherwise, it's only gonna encourage more bioballs. Terran needs to get back to it's roots as a defensive, map-control race and buffing tanks would help with that.
Again, if we flat out buff Tanks, 1-1-1 will be OP in TvT and TvP. Mech will also be the go-to composition in TvT, with no Marine/Tank or Bio play.
Plus, maps with closer positions will be too Terran favoured, personally I'm in favour of more versatile map designs and not only Macro maps like Cloud Kingdom.
There are two things keeping tanks from being great in TvP.
The first is the post you quoted. Terran's early game is extremely strong, terrans are able to have very greedy openings like 3cc, and on equal bases terran will almost always have higher incomes. Were terran mech akin to BW, a greedy opening transitioning into them would be too strong in general. In BW the strength of mech was accounted for by the other races inevitable having much stronger economies.
The second is that there is nothing to actually get in the way. Comparing numbers, WoL tanks are actually very similar performance-wise to BW ones. The cost 25 gas and 1 supply more, and in exchange get a bunch of benefits (more range, smart fire, better when unsieged) while still having similar DPS while sieged (WoL tanks fire significantly faster). What made tanks truly strong in BW? You try running into them and your entire army dies to spider mines.
The first point can't be addressed unless MMM is nerfed (and possibly banshees), and that isn't going to happen. The second, with tweaks to widow mines (and BH to serve as a better "meat" wall) could definitely make tanks viable.
That's one possibility. Another is that, paying Minerals and
Gas for a widow mine is too expensive to build enough to actually do a lot, and they get taken out using Colossus/Tempest plus Observer, or even carpet Psi-Storms.
I suppose Blizzard could ignore my suggestion and go for this, though I wonder how fun it would be to watch. I'll have to wait and see.