Will the Monero command line daemon/wallet programs still be available after the release of the official GUI?
Will Monerod will be blended in similarly to how bitcoin core node/wallet is?
Will command line still be available after the release of the official GUI?
Yes, it will. As far as I know, there will be support for both in the future. Thus, you will have
monero-wallet-cli, which is the command line wallet, and
monero-wallet-gui, which will be the GUI wallet.
Will Monerod will be blended in similarly of what bitcoin core node/wallet is?
In the future, yes, see the feature request opened here. For now, however,
monero-wallet-gui will be a separate binary that has to run alongside
monerod. However, the GUI has a progress bar that shows the syncing status of
monerod. Thus, new users would only have to open
monerod and let it sync. They can monitor the progress in
monero-wallet-gui might not be the official naming, but I used it in this answer for convenience.
Yes, the command line wallet will be available.
In the near future, a RPC wallet daemon will still be needed, and this is currently the same binary used by the command line wallet.
Moreover, it is much easier to add/change features without having to bother with GUI changes at the same time.
Additionally, it means the wallet can be used via ssh, or X-less systems.
Last, it will stay maintained as long as at least one coder keeps on maintaining it, and this is likely to be a long time. However, I could totally see some features being GUI only: for instance integrated QR code generation and recognition (not saying this will be in the GUI, but rather being unsuited for a command line wallet).