No, that's my point. It's impossible to speculate without more information. To give an example, if the earth in a million years has giant pools of mercury rather than oceans of water, life, if any survives, would look different than it does now. It would be reasonable under this scenario, for example, to speculate that organisms that don't require water would be found. (What the physical form of these organisms would be is difficult to determine.) It would be reasonable to speculate that any organisms that would live in the mercury oceans would have body shapes that are more streamlined than fish and aquatic mammal are currently. Prediction is a tricky thing, however. We currently can't predict the weather with any degree of accuracy more than a day or two ahead of time. That doesn't mean we don't understand the mechanisms of weather, however. You could be expected to reasonably speculate about your great, great, great, great grandchildrens' hair color, but you would probably be wrong.
The evolution arguement is such that time explains everything. Yes a man and a maple tree are 2 completely types of organisms, why is this? Because 2 billion years passed by! Isn't it obvious when you notice you are not sprouting leaves and the tree is! Billions and billions I tell you , man!