Pikemen are the exception to the rule, which is why I'm against debuffing their Open bonus. Their only advantage right now is that you can't afford to hit them carelessly while they're marching across Open terrain. I think they're fine as they are, cost and all. Debuffing them and lowering their cost won't see them built more; it will just make them a more useless unit that is still solely produced when it's free.
We will see many more two-turn units built in Beta4 because players will need to get rid of their extra gold. I believe it was Snotling who said hero offers will be changed as suggested, and I speculate he was referring to KGB's post. So now on (for instance) West Illuria, where you can be gaining 1200-1600 gold per turn after upkeep, you'll see players upping the quality of their city production during the turns they have to wait for a hero offer.
Giants could stand to have their cost upped and be +3 on Hills, which would give them a powerful niche and a distinctive advantage over Dwarfs. They'd still be inferior or equal to all other two-turn units in City battles and Open battles, which are 90% of battles on most maps. They'll also still have a maximum 10 strength before bless (if I understand the bonus system correctly).