How many lifetimes would a community interested in demonstrating by real observation a process that would take millions of years to occur need?
Is it realistic to accept without hesitation human conclusions about processes that no human can really verify by observation?
Is it really scientific to speculate about processes that supposedly take millions of years to complete?
Events of the past leave evidence in the present.
Evolutionary processes are quite well understood and as a result, we can make predictions about what we should and shouldn't find in contemporary genomes if evolution had occurred in the past and species share ancestry.
The collective genome of all things we have sequenced so far fit these predictions like a glove.
Life's DNA looks exactly like it should look were it the result of evolution.
We don't need to observe 7 million years of evolution to witness something like the split which lead to chimps and humans.
Just like we don't need to observe the conception, birth and lives of siblings to demonstrate that they share the same biological parents.
All we need is a DNA sample.