Depends on what you're relying on it to do for you, I suppose.
The current development snapshots of PuTTY support basic serial port access, i.e. reading from the serial port and feeding the data to the terminal window, and reading keypresses and sending them to the serial port. The usual serial configuration (baud rate, stop bits, flow control etc) is supported; all the usual PuTTY terminal features are also supported. (My dad, in an impressive display of misunderstanding, spent five minutes on the phone making sure that serial-PuTTY would support scrollback as network-PuTTY does. It took him five minutes because I couldn't quite believe he could be in any doubt!)
So if that's all you asked of Minicom, you can probably chuck it out right now (or at least after ten minutes of testing). If you were also after more interesting things like zmodem file transfer, it might be a while yet; zmodem has been on the PuTTY wishlist for a long time and we've always considered it to have low priority. Though that may need to change now we do serial ports, over which it's significantly less redundant than it is over SSH sessions...
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The current development snapshots of PuTTY support basic serial port access, i.e. reading from the serial port and feeding the data to the terminal window, and reading keypresses and sending them to the serial port. The usual serial configuration (baud rate, stop bits, flow control etc) is supported; all the usual PuTTY terminal features are also supported. (My dad, in an impressive display of misunderstanding, spent five minutes on the phone making sure that serial-PuTTY would support scrollback as network-PuTTY does. It took him five minutes because I couldn't quite believe he could be in any doubt!)
So if that's all you asked of Minicom, you can probably chuck it out right now (or at least after ten minutes of testing). If you were also after more interesting things like zmodem file transfer, it might be a while yet; zmodem has been on the PuTTY wishlist for a long time and we've always considered it to have low priority. Though that may need to change now we do serial ports, over which it's significantly less redundant than it is over SSH sessions...