Worried about my build

Ok, so this is worrying me, so far i have soloed Brutus in Cruel and had absolutely no problems doing so, but i read so much of this "melee can't tank endgame" that it makes me doublt my build.
Im trying a tanky-caster cold centered templar, with freezing pulse, determination and clarity.
Do you think it will become impossible to get to endgame with a build like this?
I also have Molten Shield and Enduring Cry, and Ice Nova for some utility.

http://www.pathofexile.com/passive-skill-tree/AAAAAgUAAnEEswVbEGkUTRhdGjIaOBpsI00pTzCXOYo62EA2RHJG103YT31RYGBtZp59U4BWgW-Cm4M4hMSLjIx2kFWb7J2Ana6ePKIAp4SplbT5tobAGuFz5CLsOO0g8B8=

This is the skill tree so far, im gonna finish the second Body And Soul, head towards Frost Walker and then go down to mara's start to get Diamond Skin, Armor Mastery and Hearth of the Gladiator, then get more dps with Heart of Ice.

The supps for FP that i'll look to get are Faster Projectiles, Iron Will and Lesser Multiple Proj.

Im up to 75% all res and 800 armor with determination on in Cruel.

1.) Freezing Pulse isn't Melee.
2.) Melee works right if you do it right.
3.) Ice Nova will most likely become useless
4.) Get Spell Totem + summon skeletons as meat shield
5.) I don't really know why you chose all those melee nodes..
6.) You won't have enough accuracy to hit them melee
7.) Unspec those melee nodes freezing pulse is better.
8.) Use greater multiple projectiles w/ freezing pulse
9.) I don't recommend iron as it will make you cast slower.
10.) Get dual curse instead of those frost specs for insane dmg boost.
11.) Elemental Weakness + Frostbite as your 2 curses!
12.) Freezing Pulse + Greater Mult Proj + Faster Cast + Mana Leech
13.) Firestorm + Faster Cast + Life Leech


Skill tree:
Thats what I would do anyways.

dual curses is such a huge dmg multiplier for rare mobs.

Don't get dual curses till endgame though. hit up marauder resist nodes, get dual curse, then I would aim for more life on the marauder area and hit up that shield block by marauder too. Get the unique ammy w/ 50% spellblock as well.
Go for blocking and use tempest shield as well.