Poka-chu

Now I picture some ripped guy casually riding a wave while doing Bodybuidling poses and flexing.

^{I'd totally watch this.}

the media tends to say things like "the race is on!" and so on.

Ha, don't worry. They've been saying that about Fusion since the 50ies, and are showing no sign of ever stopping to say it. Hasn't been a problem for the popularity of the idea.

I work in cell culture, and talk about the topic a lot. The main objection people have is purely emotional, and hardly open to arguments like the two you presented, however convincing. It's simply the "icky-factor".

However, I'm pretty confident that enough people are open-minded enough to try it so that producing it will remain worthwhile for long enough for people to get used to the idea. Time is probably the most effective way to tackle the "icky-factor" there is.

That probably depends on how much it can be automized. I work in tissue culture, and manual work in a lab produces an insane amount of plastic waste, since everything is single-use. Pippettes, beakers, flasks... nobody uses glass anymore, because you can't risk somethink breaking and a worker cutting themselves in the vicinity of immortalized cell cultures, or contaminating the cultures.

On a usual work day I fill a large rubbish bag just with single-use plastics. A robot could work with much less waste, since it could handle larger reservoirs of liquids rather than single bottles, and guarantee that the pippettes never touch anything they're nut supposed to touch. Also culturing cells in larger vessels would result in less waste - Bacteria can be cultured in huge tanks with several tons of liquid. If someone were to achieve a working machine of that size that could culture mammalian cells, that would be an enormous jump in efficiency and waste-reduction.

Therefore decisions resulting from their addiction aren't fully in their control, as there is a biological root which they are unable to change.

There is a biological root for sexual arousal, yet not all men are rapists. The position that points to a biological cause (or causes) does not imply total blamelessness. It does not imply a lack of choice, it just attempts to explain why people make choices that are obviously poor ones.