Totally agree with the above post that LH will make decisions based on economics, not politics.
There are also some strong arguments for larger carriers to still mix their fleets as:
- Better buying power in the future being able to play one manufacturer off against another for the next wave of purchases in years to come.
- Not having "all your eggs in one basket" from a risk management point of view.
- Whilst the A380 will undoubtedly be best for some routes, the sector length combined with slightly lower passenger and probably slightly higher cargo carrying capacity (and revenue) on other routes will undoubtedly favour the 747-800.
With a large carrier such as LH they would have a large enough fleet of each type to still make each fleet viable in terms of economics, flexibility, crewing, training, etc. Yes there will inevitably be some disadvantages compared to a single manufacturer, but no doubt these are outweighed by the points above.