Mixed emotions here. I think it makes every sense for Opera to do this. The cost of maintaining their own rendering engine must have been huge and the advantages it brought were slender. It's also good to have another major player contributing to webkit. On the other hand it's a step closer to an unhealthy monoculture in rendering engines. It's already the case for the mobile web that people are starting to define st…
Is a monoculture as bad as it might seem though? Front end web development is a clusterfuck. Webkit is open source, unlike the almost monoculture that ie6 represented. It can be forked and evolution can continue. Ditch -webkit -mos and -o. Like when the dinosaurs experienced a mass extinction event and mammals bloomed from a shrew into cats and humans.
Yes, but only on WebKit-derivates. To use your analogy, it's sort of like trying to make better dinosaurs and deciding that we might as give up on apes at this point, because they don't seem as powerful and get eaten by the dinosaurs anyway.