Yes. Having an implant is too risky, especially with an asset or currency like Bitcoin which is highly valuable. It would be a huge target for theft, exposing the risk of death. Also, it may break anonymity when using it, which goes against Bitcoin's value proposition.
I was only talking about implants for Bitcoin at first, as a possibility to become a reality, but I guess that the health and security risks prevail, making such concept not practical for real world usage.
However, as technology advances we might not see implants, but rather something that would be even better, with security and health over its users in mind. In the meantime, we could focus on using hardware and/or software wallets, as they provide all the necessary functionality to send and receive Bitcoin. Just my opinion.
We should also think of good idea with constructive criticism, not all robbers will know if we wear implants or not because this is still privacy, If we talk 100 years ahead of course the use of implants will be in accordance with era development where radiation and global security system is adapted to adapt the implant. Developers will also think about anticipation if implants are used unreasonably from robbers (hand pieces etc), then their chip will switch off by itself using gps system. I think using bitcoin implants also requires keywords to perform all transaction.