Yes it has a very long wait for new stock, you would have thought they
would have ordered new stock the same time as the Victoria line or at
least the same time as the Piccadilly line stock. The reason that new
stock is not been ordered sooner is that the Bakerloo is seen somewhat
as a 'cinderella line' with it's passenger numbers a fraction of the
other tube lines. With all the problems that exist on some of the new
stock from the Central and Northern lines you do wonder whether when it
does have it's stock renewed it will end up being cascaded stock from
either Jubilee or Northern (Central stock apparently cannot be cascaded
without modification), I would not be surprised by then if some of the
nineties stock was being replaced due to reliability problems,
apparently a few years Tfl had severe worries about the long term
future of the Central line stock and replacement was even been
discussed and that is twenty years newer!!

If replacement is scheduled for 2019 also add a few years ie 2022/2023
as deadlines tend to come and go regarding new trains