I think he is to some extent, but there's a long way to go yet. Oh and if no term limits equals dictatorship, I guess the UK has always been one. I like term limits, but at the end of the day as long as the leader is subject to being voted out in free and fair elections, then democracy is satisfied. Venezuela is still there. I hope it stays there.
How about abolishing elections for mayor? Or beign able to suspend any election for governor, without court or congress approval, at any place at any time? Both of those powers are predicted within his constitutional change.
As for the OP question. No, he is not on the road to become a dictator. He already is one. The vote tomorrow is nothing but an attempt to justify his tyranny, if he loses the reform will pass either by fraud or force. And he already said he will arrest anyone who says there was fraud.
Let's just hope he eats some rotten fish and dies, or suffers a car crash, or the impact of a meteorite. Quite frankly I have no respect, intelectual or moral, for someone who supports that murderous dictator.