An ideal, low maintenance automation takes 6-9 months to develop. Anything that takes longer to develop is not Efficient. Its complex and is expensive for an organization.   

Short term implications: 

• Cost of development is higher.
• Transition is expensive – Other systems and processes are in a flux till the system is implemented and is more cumbersome for the users.

Long Term Implications:

• Maintenance Cost is higher – Running the business as well as modifications
• Complexity of the system, reduces life of software