New Veteran: Bunkansee

You really would want this. But frankly tera, it will result in carnage.
Terrorblade is one of those heroes that are quietly linked to meta picks. His skill set is that of an anti carry farmer. Thus, he excels when it comes to ricing and when push is given an incentive.

You would require a lot of changes to glyphs, tower bounties, illusion durations, damage counters and the balance changes to a host of heroes.

Not doing this and taking the easy way would result in the horror of 6.81 terrorblade where the darn demon finished the game in 25 minutes, with a HoTD,manta and PTs.
We dont want that.

I can assure you i have 5 iterations at work and indeed the one i posted is near best. But it still results in a demon marauder that will wreck T1s and offlaners with just 1 good lane support like a lich.

I am well aware of this, and frankly those 3 changes seem reasonable. I also recognise that sweeping meta changes are required to make TB a common and viable pick. I also don't want ANY hero to be excessively common like Leshrac. My dream is for a patch where anything can work... as impossible as that likely is.

The 'easy way out', as you have dubbed it, is also the worst way of balancing the Hero ie buffing his Strength/Strength gain. Look at 6.82 - there was so much gold going around through ricing and comebacks that TB was god-tier - also Spectre was popular, and he utterly destroys her in a game, so that's his counter-carry element.

His viability is, as you said, linked to the viability of push, ricing, illusion mechanics, his counters/who he counters, and of course the hero himself. However, and this may not count for much from a 3k player, he does quite a few things, and if even two of these were very viable strats he'd be broken. Hell, the only thing keeping him from 6.83 was the popularity of Lion and [{Storm Spirit]]...

It's why I've been campaigning for the removal of his anti-carry abilities. Instead of being a pusher/carry/countercarry, he'd just be a carry/pusher like... well, like Naga and Morph. However, only thing limiting his pushing is that his illusions take twenty bajillion damage from everything. Hence increasing their durability solves what may well be the hero's biggest issue, as TB's own survivability can be assured with his core items. ~2.8k hp with 70% phys resist is rather a lot.

Do also bear in mind that the hero ALREADY wrecks T1s and offlaners if he gets a decent start with a good support. So I see where the Meta nerfs are coming from, and it's why I still think it'd be better in his ultimate slot.

But yes, if those changes up there go through, I'll be content. While he won't be a top tier pick (thankfully; I hate being one of those meta spammers), he can see situational use.

PS: Manta HotD and PTs by 25 minutes is ****py farm. Should be almost to a Skadi by then, also early HotD is so very situational :)