You based your calculation on the 60k$ for each bitcoin you will earn? it seems that this is wrong because the price of bitcoin is currently around 20k$+ its value is playing in the market today.
Answer: It will only last depending on the overall quality of the unit, or it depends on several factors like the level of maintenance.
But most of the time the life span of the ASIC miner is typically in between 1-2 years.
Answer: As far as I know, upgrading most of the time aims to improve the scalability of the bitcoin network by simply making it more efficient
to use complex smart contracts. Therefore, if a taproot upgrade is proposed to upgrade to the bitcoin protocol, it means Asic will
not make obsolete or inefficient. but ofc course it does not change the process of mining, which is still based on SHA-256,
the proof-of-work algorithm that ASICs are optimized for.
Answer: Your computation is wrong if you based on 60k$ each bitcoin.
Answer: No one knows dude, coz you know the market is too unpredictable and you know also that as well.
Answer: In my honest opinion, this could be a profitable investment. But you must always remember that the future price of Bitcoin is very
uncertain. Meaning, reaching 100k$ or 200k$ for each bitcoin is not guaranteed. Although, the majority of the community in this
industry believed in these things. Aside from that, the mining bitcoin difficulty is also increasing, which it can also make it less
profitable to mine as time goes by.